RS-232↔485/422 CONVERTERS
Table 2 (continued). DTE Jumper Settings.
Function | Jumper Requirements | |
|
|
|
9. | S3 Off | No line bias |
Safe), Receive |
|
|
| S3 On | Line biased |
|
|
|
NOTE
If line bias is on, the
3.3 Typical Applications
This section describes some typical applications where the
Figure 5 shows a typical point-to-point, 4-wire, full- or half-duplex connection with both RS-232↔485/422 Converters terminated by setting switch S2 to the TERM position. Figure 6 shows a typical point-to-point, 2-wire, half-duplex connection with both RS-232↔485/422 Converters terminated by setting switch S2 to the TERM position.
In a 4-wire, point-to-point application, each of the drivers on the two RS-232↔485/422 Converters may always be enabled without any adverse effects.
In a 2-wire, point-to-point or multipoint application, only one driver may be enabled at any one time. If more than one driver is turned ON, a situation known as contention occurs and the data from one driver interferes with the data from the other driver. This results in both sets of data being unintelligible.
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